Lubricating compositions containing benzo-(1&#39;,3&#39;,2&#39;-)dioxaphospholes

ABSTRACT

PHOSPHOROUS DERIVATIVES OF O-DIHYDROXYBENZENES EFFECTIVE A LUBRICANT ADDITIVES ARE DEFINED BY THE FORMULA:   2-(Z=),2-Y-1,3,2-BENZODIOXAPHOSPHOLE   WHREIN Z REPRESENTS OXYGEN OR SULFUR OR MAY BE ABSENT; Y REPESENTS NHR OR NR2, WHERE R IS ALKYL HAVING UP TO 30 CARBON ATOMS IN THE CHAIN OR ARYL OR ARLAKYL HAVING UP TO 22 CARBONS. THE COMPOUNDS ARE USEFUL IN LUBRICATING COMPOSITIONS WHEN PRESENT THEREIN IN AN AMOUNT RANGING FROM ABOUT 0.01 TO 50 PERCENT BY WEIGHT OF THE COMPOSITION.

United States Patent Office 3,812,033 Patented May 21, 1974 US. Cl. 25246.7 4 Claims ABSTRACT OF THE DISCLOSURE Phosphorus derivatives of o-dihydroxybenzenes efiective as lubricant additives are defined by the formula:

wherein Z represents oxygen or sulfur or may be absent; Y represents NHR or NR where R is alkyl having up to 30 carbon atoms in the chain or aryl or aralkyl having up to 22 carbons. The compounds are useful in lubricating compositions when present therein in an amount ranging from about 0.01 to 50 percent by weight of the composition.

This a division of application Ser. No. 185,387, filed Sept. 30, 1971.

This invention relates to novel derivatives of o-dihydroxybenzenes which find utility as lubricant additives in lubricating oils and to lubricating compositions containing such compounds.

The compounds of the invention can be represented by the following general formula:

wherein Z represents oxygen or sulfur or may be absent; Y represents NHR or NR where R is a straight chained or branched alkyl group having up to 30 carbon atoms in the chain; or aryl or aralkyl having up to 2 carbon atoms in the ring.

The compounds are prepared by the following reaction:

The starting material where Z is absent is prepared from catechol and P01 according to the procedure given in J. Chem. Soc. 1958, 4250. The starting material where Z is oxygen is prepared from catechol, PCl and acetone according to the method given in Chem. Ber. 99 2631 (1966). The starting material where Z is sulfur is pre pared from the first-named compound according to the method of Ber. Dtsch. Chem. Gesellsch. 61, 1264 (1928).

The preparative procedures differ slight as regards the kind of solvents used and are illustrated below by referring to the synthesis of specific compounds. The physical properties of the compounds are given in Table I-III 5 below.

Lubricating compositions according to the invention comprise a lubricating agent such as a mineral oil or a grease to which has been added from 0.01 to 50 percent by weight of at least one compound of the invention.

PROCEDURE 1 Preparation of 2'-amino-benzo-(l',3,2'-dioxaphospholes) 174.5 g. (1 mole) 2-chloro-benzo-( 1',3,2-dioxaphosphole) (Formula I with Z absent) is dissolved in 1 liter of dry benzene at room temperature in a flask protected from moisture by a CaCl tube and provided with a stirrer, a dropping funnel and a gas inlet for dry nitrogen gas. To this solution is added 2 moles of a primary or a secondary amine (Method A) or a mixture of 1 mole of a primary or a secondary amine and 1 mole of a tertiary amine 1 (Method B) at such a rate that the temperature of the mixture does not rise over 30-40" C. After addition of all the amine the mixture is stirred at room temperature for 3 hours whereafter the formed precipitate is filtered off. The solvent is evaporated from the filtrate leaving the desired product as a slightly yellow oil or as a white solid. The product can be purified either by distillation under reduced pressure or by recrystallization from benzenehexane mixtures (see Table I).

PROCEDURE 2 Preparation of 2'-amino-2'-oxo-benzo-(1,3',2'- dioxaphospholes) The procedure is the same as Procedure 1 except that the starting material, 2 chloro-2'-oxo-benzo-(1',3',2-di oxaphosphole) (Formula I with Z=O) was dissolved in 3.2 liters of dry diethyl-ether per mole instead of benzene as in Procedure 1. The results are summarized in Table II.

PROCEDURE 3 Preparation of 2-amino-2'-thio-benzo-(1',3',2'-

dioxaphospholes) The procedure is the same as Procedure 1 except that the starting material, 2-chloro-2-thio-benzo-1',3',2'-dioxaphosphole) (Formula I with 2:8) is dissolved in a mixture of 2.5 liters diethylether and 0.8 liters benzene per mole. The results are summarized in Table III.

TABLE I Preparation of 2'-amlno-bcnzo-(1, 3, 2-dioxaphosph0les) (Procedure 1) 1 Method A: 2 moles of amine RZNH per male or starting material are used; Method B: 1 mole oi amine RzNH and 1 mole of EtzN per mole of starting material are used.

1 Primene 81-R is an (N -tert.-alkylamino) group.

The tertiary amine used was triethylamine (EtsN). Pyridine and other tertiary amines can be used as well.

TABLE II Preparation oi 2'-amino-2-oxo-benzo(1', 3, 2-dioxaphospholes) (Procedure 2) Method of prep- Yield, M.P. 13.1. 0.)] NR; aration 1 percent 0.) mm. Hg

n-CzHqNH A 66. 6 86-88 165/2 n-CnHnsNH--- A 80 48-51 205/1 Prirnene 81-R. B 83 CcHsNH A 77 l/0.9 p-Cr2H2sCaH4NH.- B 100 2152l7/O.9 (n-C;H1)1N A 73 44 135/ (n-CmHmzN B 100 1 Method A: 2 moles of amine, RZNH, per mole of starting material are used; Method B: 1 mole oi amine, RaNH, and 1 mole of EtzN per mole of Starting material are used.

1 Method A: 2 moles of amine RzNH per mole of staring material are used; Method B: 1 mole of amine RQNH and 1 mole of EhN per mole of starting material are used.

1 The reaction mixture had to be refluxed for 3 to 6 hours.

The compounds of the invention were tested for their lubricating properties by the Navy Wear Test and by the Rotary Bomb Oxidation Test, as was a commercially used lubricating oil additive, TLA 111 (zinc dithiophosphate). The Rotary Bomb Test is the well-known ASTM 2272 test. The higher the value obtained the better the anti-oxidant properties of the sample. The Navy Wear Test is designed for the study of anti-wear properties of lubricants under controlled temperatures, moderate pressures and constant speeds. In this test, steel balls of 0.5" diameter are cleaned, dried and locked in position in a test cup. A charge of 10 to cc. of the lubricant is then put in the cup. Separate runs of 10, 40, 70 and 100 minutes duration are then conducted at a speed of 1,800 r.p.m. on the four-ball wear tester. The test load is 28 kg. at room temperature. The wear in terms of microns per minute is calculated from the average scar diameter (mm.) as follows:

Wear in micronslmin.= j (1000) where d=d 5+d +d +d =scar diameter at each time period.

h =Hertz diameter (0.265 mm.)

h for the four-period separate runs=4h t=tirne of run in minutes 2: for the four-period runs=220 min.

4 The tests are repeated with the additives to be tested. Additives are considered beneficial with respect to antiwear properties with a result up to 3 microns per minute, fair from 3 to 7 microns.

TABLE IV Bench tests 2 percent by weight of compounds in 145 P pale turbine oil Rotary Navy bomb wear test oxidation (micron/ test min.) (min U /PNHC1IH2I PNHOrH|Cu n /PNH Primene 81-R \i? /PNH Primene 81-R O P-N (C3111):

6..- pale turbine Oil..;.:...;.:.:.;.;:: 6.6 20 7 TLA 111 (zinc dithiophosphate) 2. 6 210 As shown in Table IV, the compounds of the invention which were tested gave nearly equal or better results in the Navy Wear Test than did the commercial additive TLA 111. In both that test and in the Rotary Bomb Oxidation Test the subject compounds improved the lubricating properties of the oil to which they had been added.

While the invention has been illustrated vw'th reference to specific compounds in which the benzenoid moiety is unsubstituted it will be understood by those skilled in this art that fully equivalent compounds can have one or more lower alkyl, haloalkyl, halo and similar substituents on the benzene ring. Such derivatives fall within the scope of the appended claims.

What is claimed is:

1. A lubricating composition comprising a lubricating agent and from about 0.01 to 50 percent by weight of a compound of the formula:

wherein Z represents oxygen or sulfur or may be absent; Y represents NHR or NR where R is alkyl having up to 30 carbons in the chain or aryl or aralkyl having up to 22 carbons.

5 6 2. The composition of claim 1 wherein Z is absent and References Cited Y 15 H'C3H7NH, H-C12H25NH, p-C H C H NH or P a r)z 2,875,235 2/1959 Lanham 252-46.? X 3. The composition of claim 1 wherein Z is oxygen and 5 96 8/ 1961 DfibO 25249.9 X Yi .c -c CGHsNH, P-CI2H25CGH4NH, 3,321,401 5/1967 Ford et a1. 25246.7 -(3 110 or (n c12H25)2N 3,327,024 6/1967 De Young et al. 260937 X 4. The composition of claim 1 wherein Z is sulfur and 3,476,685 11/1969 Oberellder 6t 81- 25246.7

10 HELEN M. S. SNEED, Primary Examiner 

